package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Category;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;

    //菜品和套餐之间的联系
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    //菜品 口味Mapper
    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增菜品
     * @param dishDTO
     */
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();

        //得到口味
        List<DishFlavor> flavors = dishDTO.getFlavors();

        //属性拷贝
        BeanUtils.copyProperties(dishDTO,dish);

        dishMapper.insert(dish);

        Long id = dish.getId();

        if(flavors!=null && flavors.size()>0){
            flavors.forEach(dishFlavor->dishFlavor.setDishId(id));
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult queryPage(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.queryPage(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 菜品批量删除
     * @param ids
     */
    @Override
    @Transactional //事务
    public void deleteBatch(List<Long> ids) {
        //起售中的菜品不能删除
        for (Long id : ids) {
            Dish dish = dishMapper.selectById(id);
            if (dish.getStatus() == StatusConstant.ENABLE){
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //被套餐关联的菜品不能删除
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds !=null && setmealIds.size()>0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品后，关联的口味也需要删除掉
        for (Long id : ids) {
            //删除菜品
            dishMapper.deleteById(id);
            //关联的口味也删除掉
            dishFlavorMapper.deleteByDishId(id);
        }
    }

    /**
     * 根据id查找菜品和口味
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查找菜品
        Dish dish = dishMapper.selectById(id);
        //根据id查找口味
        List<DishFlavor> flavors = dishFlavorMapper.selectFlavorByDishId(id);
        //创建DishVO进行属性拷贝
        DishVO dishVO = new DishVO();
        //属性拷贝
        BeanUtils.copyProperties(dish,dishVO);
        //给dishVO中的 口味属性进行复制
        dishVO.setFlavors(flavors);
        return dishVO;
    }

    /**
     * 修改菜品with口味
     * @return
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Long dishId = dishDTO.getId();
        //修改菜品的部分
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品表基本信息
        dishMapper.update(dish);

        //删除原来有的口味
        dishFlavorMapper.deleteByDishId(dishId);
        //添加新的口味
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors!=null && flavors.size()>0){
            flavors.forEach(dishFlavor->dishFlavor.setDishId(dishId));
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.selectFlavorByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

    /**
     * 菜品 启用、禁用
     * @param status
     * @param id
     * @return
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
//                .updateTime(LocalDateTime.now())
//                .updateUser(BaseContext.getCurrentId())
                .build();
        dishMapper.update(dish);
    }
}
